[Webkit-unassigned] [Bug 195378] Layer with no backing store should still hit-test over a scroller

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=195378

--- Comment #12 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
This cause assertions like:

 ASSERTION FAILED: clipRectsContext.rootLayer == m_clipRectsCache->m_clipRectsRoot[clipRectsType] 

0   com.apple.JavaScriptCore            0x000000070f1be55e WTFCrash + 14 (Assertions.cpp:305)
1   com.apple.WebCore                   0x00000006f84d14eb WTFCrashWithInfo(int, char const*, char const*, int) + 27
2   com.apple.WebCore                   0x00000006fbba5629 WebCore::RenderLayer::updateClipRects(WebCore::RenderLayer::ClipRectsContext const&) + 345 (RenderLayer.cpp:5349)
3   com.apple.WebCore                   0x00000006fbba6acf WebCore::RenderLayer::parentClipRects(WebCore::RenderLayer::ClipRectsContext const&) const + 255
4   com.apple.WebCore                   0x00000006fbba6bbf WebCore::RenderLayer::backgroundClipRect(WebCore::RenderLayer::ClipRectsContext const&) const::$_1::operator()() const + 223 (RenderLayer.cpp:5499)
5   com.apple.WebCore                   0x00000006fbb9a77e WebCore::RenderLayer::backgroundClipRect(WebCore::RenderLayer::ClipRectsContext const&) const + 158 (RenderLayer.cpp:5507)
6   com.apple.WebCore                   0x00000006fbba10b0 WebCore::RenderLayer::calculateRects(WebCore::RenderLayer::ClipRectsContext const&, WebCore::LayoutRect const&, WebCore::LayoutRect&, WebCore::ClipRect&, WebCore::ClipRect&, WebCore::LayoutSize const&) const + 112 (RenderLayer.cpp:5519)
7   com.apple.WebCore                   0x00000006fbb9ec0f WebCore::RenderLayer::collectFragments(WTF::Vector<WebCore::LayerFragment, 1ul, WTF::CrashOnOverflow, 16ul>&, WebCore::RenderLayer const*, WebCore::LayoutRect const&, WebCore::RenderLayer::PaginationInclusionMode, WebCore::ClipRectsType, WebCore::OverlayScrollbarSizeRelevancy, WebCore::ShouldRespectOverflowClip, WebCore::LayoutSize const&, WebCore::LayoutRect const*, WebCore::ShouldApplyRootOffsetToFragments) + 303 (RenderLayer.cpp:4516)
8   com.apple.WebCore                   0x00000006fbb9ba05 WebCore::RenderLayer::paintLayerContents(WebCore::GraphicsContext&, WebCore::RenderLayer::LayerPaintingInfo const&, WTF::OptionSet<WebCore::RenderLayer::PaintLayerFlag>) + 2885 (RenderLayer.cpp:4339)

because the paint triggered by RenderLayerBacking::updateEventRegion() caches the wrong clip rect roots.

Also, why are we paying the cost for this event region computation on macOS?

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